Airtight container cover that is made by double injection molding method

ABSTRACT

A thin packing cover needs some pressing and bending process to stick the packing material into the main cover. This inventory is the packing cover which can be manufactured without bending or pressing the main cover by the processing of double injection molding method that can inject the packing plastic material from upper and under packing place of the main cover.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a cover of container made ofplastic, more particularly to a cover of container, which its airtightpower is increased and a soil molding material and a rigid moldingmaterial can be stuck to each other, so that after molding, the cover isto be made smooth and flat.

[0003] At the recent years, the prior art is represented as a containercover made by double injection molding method as shown in FIG. 6, whichis that after the body (11) of the cap (10) is made at first, the part(10 a) that is combined with the container (20) is made of a softmaterial on the outer border of the cap (10) by double injection moldingmethod, which is formed the body (11), so that the combining part (10 a)has a better airtight power by means of the soft viscosity,

[0004] However, this kind of prior art has some problems such as thecovered pat is scaling off and when cooled, the torture is produced,which is not made the cover smooth and flat, because of the differencesin the molding condition with the body (11) of the cap in regard thatthe body (11) of the cap is usually injection-molded in the thickness of1 mm and that thickness of the cover, which is molded in the methodcovering over, is 0.1 mm.

[0005] Therefore, in order to prevent this torture, as shown in FIG. 7,when the body (11) is formed as one with the combining part (1 a) bydouble injection molding method, the inside part of the combining part(10 a) is coating-treated with a soft material, so that thecoating-treated part (13) has a great airtight power due to theviscosity.

[0006] Nevertheless, it is difficult to coat only the inside part andbecause there is no way to connect the coating-treated part with thebody (11), the coated-treated part is scaling after all.

[0007] 2. Discussion or Related Art

[0008] Thus, in order to solve the above-mentioned problem, as thecoating layer is formed inside part of the combining part (10 a) bydouble injection molding method, the said coating layer is protrudedtoward the top through the hole or the opening part on the cover, so theairtight power is improved and the appearance is excellent as well asthe coating layer that is formed inside of the combining part (10 a) maynot be separated.

[0009] Brief Description of the Attached Drawings

[0010]FIG. 1 is a perspective view according to the embodiment of thepresent invention

[0011]FIG. 2 is a perspective view showing the hole of the cover

[0012]FIG. 3 is a perspective view showing the opening part instead ofthe said hole

[0013]FIG. 4 is a sectional view showing the formation of the outerwall.

[0014]FIG. 4A is a sectional view showing the formation of the innerwall

[0015]FIG. 5 is a perspective view showing the hole perforated on thecover of the container.

[0016]FIG. 6 is a sectional view of the embodiment of the prior art madeby double injection molding method

[0017]FIG. 7 is a sectional view showing the coating layer of the priorart

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

[0018] The following is the detailed description of the most desirableembodiment of the present invention. The most desirable embodiment ofthis invention will be to described in detail according to the attacheddrawings on the following and the same referenced number will be used tomean the same drawing elements regardless of different drawings.

[0019] As shown in FIGS. 1 and 4, while the combining part (10 a)wherein the cap (10) and the container (20) is combined, is formed onwith the body (11) of the cap, the coating layer (1) is formed insidethe combining part (10 a) and the coating layer is protruded toward thesurface of the cap (10) through the bole (3), forming the protrusion.This is designed to protect the coating layer (1) from being scalingoff.

[0020] The size and location of the hole (3) depends on the shape of thesurface of the body, and the opening part (4) can be used as analternative to the hole (3).

[0021] Also, the trademark of the product is printed on the surface ofthe protrusion (2) that is protruded toward the top of the cap (10). Thetrademark is printed on the mold which is used only for double injectionmolding method. Therefore, it can lead to various kinds of low-costproducts' production.

[0022] And producing various kinds of products would be possible whenthe protrusion (2) is formed in one along the outline of the cap or isformed at an interval of a fixed space.

[0023] When the protrusion (2) is formed in one through the bole (3)made in the top of the cap by making a hole in the inner wall of thecombining part wherein tile cap (10) and the container (20) is combined,the air tight power is improved and the cap can be prevented from beingbent.

[0024] Also, tile inner wall is formed by double injection moldingmethod and the protrusion (2) is formed through the hole (3) of the capafter the outer wall is formed on the combing part (10 a) wherein thecap and the container is formed.

[0025] Accordingly, the combining part (10 a) is formed in one by doubleinjection molding method with a soft molding material, resulting illpreventing the container cover from being bent. Because the coatinglayer is formed in one with the cap through the hole made in the cap,the coating layer can be firmly coated. And the protrusion is formedwhen the coating layer is exposed on the cap through the hole of thecap, so the trademark can be printed on the protrusion, making thedesign of the container better.

What is claimed is:
 1. An airtight container cover that is made bydouble injection molding method wherein its improvement comprising, abody is formed as one with the combining part, which is combined withthe container by double injection molding method, a coating layer isprotruded toward the top through the hole or the opening part on thecover, so the airtight power is improved and the appearance is excellentas well as the coating layer that is formed inside of the combining partmay not be separated.
 2. An airtight container cover that is made bydouble injection molding method as claimed in claim 1 wherein, theopening part is formed instead of the said hole.
 3. An airtightcontainer cover that is made by double injection molding method asclaimed in claim 1 wherein, the trademark of the product is printed onthe surface of the protrusion that is protruded toward the top of thecover.
 4. An airtight container cover that is made by double injectionmolding method as claimed in claim 1 wherein, the protrusion is made bydouble injection molding method with the hole in the inner wall of thecombining part through the hole on the top of the cover.
 5. An airtightcontainer cover that is made by double injection molding method asclaimed in claim 1 wherein, the protrusion is formed on the inner wallor outer wall of the combining part by double injection molding methodand protruded through the hole on the top of the cover.